(Supersedes ANSI/ASHRAE Standard ). Thermal. Environmental. Conditions for. Human Occupancy. Approved by the ASHRAE Standards Committee. See Appendix I for approval dates by the ASHRAE Standards Committee, the ASHRAE an ASHRAE Standard may be purchased from the ASHRAE Web site . This standard is in close agreement with ISO Standards and Page 1 ANSI/ASHRAE Standard R Public Review Draft Table of Contents 1.
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Local thermal discomfort caused by vertical temperature differences. Two zones are shown, one for 0. While this concern is beyond the scope of this standard, moisture on surfaces can lead to biological contamination and damage to building components.
This optional method is intended for such spaces. For example, the clothing insulation for a person wearing Ensemble 3 from Table Bl sitting in an executive chair is 0.
Standard 55 – Thermal Environmental Conditions for Human Occupancy
The graphic method utilizes an overlay on a psychrometric chart to indicate the operative temperatures and humidity at which thermal comfort is achieved in the winter 1.
For a given set of conditions, the results from the two methods are consistent and either method may be used as long as the criteria outlined in the respective section are met. If zones are interdependent or inter— active, their control diagram should be shown in total on one block diagram with the point s of interconnection identified. Ashrar, one azhrae estimate the ashrea insulation from the table provided in section five. Search the history of over billion web pages on the Internet.
If the resulting PMV value generated by the model is within the range allowed in Table 5.
The metabolic rates associated with the activities of various individuals in a space may not be averaged to find a single, average metabolic rate to be applied to that space. Indoor thermal comfort can be determined from the responses of the occupant survey. For example, Table B2 indicates that adding a thin, long- sleeve sweater to a clothing ensemble increases clothing insulation be approximately 0. Accurate data from the measurement using thermal manikins is acceptable.
Ashras activity that may be of interest is not included in this table. It was revised in,and This standard does not address acceptable floor temperatures when people sit on the floor. However, non— 55-19992 comfort factors such as skin drying, irritation of mucus membranes, dryness of the eyes, and static electricity generation may place limits on the acceptability of very low humidity environments.
These criteria may also be used for people wearing heavier footgear 55-992 may be conservative.
Guidance- The referenced ASHRAE standards allow a different specification for measurement of air speed than the ISO standard, depending on whether turbulence intensity is to be measured. Table B3 shows the net effect on clothing insulation for typical indoor clothing ensembles that results from sitting in a chair. The standard specifies conditions in which a specified fraction of the occupants will find the environment thermally acceptable.
Conditions Which Provide Thermal Comfort 5.
Interpretation for Standard 55-1981 and 55-1992
Variations that occur over a period greater than three minutes should be treated as two different air speeds. Due to increases in skin wettedness, the effect of increased speed is greater with elevated activity than with sedentary activity.
Air temperature is the average temperature of the air surrounding an ashrse. In some situations, variations with a period not greater than 15 minutes are superimposed on variations with a longer period.
In the second form, the variability results from adaptation to individual differences in response to the thermal environment. However, the conditions required for thermal comfort in spaces that are naturally conditioned are not necessarily the same as those conditions required for other indoor spaces.
ASHRAE Standard — offers a procedure for determining air speed and temperature asyrae in building spaces, and provides additional guidance for the measurement of mechanical equipment parameters. If these requirements are met and the environmental conditions inside the building fall within the indicated ashre, then compliance is achieved.
The criteria in Section 5. It is not possible to determine the thermal insulation for most sleeping or resting situations unless the individual is immobile.
Each of these groups of occupants should be considered separately in determining the conditions required asnrae comfort.
Such locations might be workstation or seating areas, depending on the function of the space. If occupancy distribution cannot be estimated, then the measurement locations shall be as follows: It does not apply to sleeping or bed rest.
Class A is used when it is desired to adhere to higher than typical comfort standards and Class C is used when it is desired to relax the typical comfort standards. Local air temperature is defined in the same way as the air temperature except that ashrwe refers to a single level e. Elevated air asurae may be used to offset an increase in the air temperature and the mean radiant temperature by not more than 3. This optional method applies only to spaces where the occupants are engaged in near sedentary physical activities with metabolic rates ranging from 1.
The PMV method does not fully account for this factor and this standard should not be applied to situations where the time-averaged metabolic rate is above 2.
Full text of “ASHRAE 55 “
Variables may be non-uniform over an occupant ‘ s body and this non— uniformity may be an important consideration in determining thermal comfort. The operative temperature range azhrae for intermediate values of clothing insulation may be determined by linear interpolation between the limits for 0.
The maximum allowable air speed for each class of environment is specified in Figure 5. All registers or terminal units should be shown and identified with type, flow, or radiant value. The function line has four segments: A ashrad schematic should be provided in block diagram with sensors, adjustable controls, and actuators accurately identified for each zone.
This table can be used ashraw with the previous one, so that one can add or subtract the clothing ensemble from the clo value of each garment. Looking for previous revisions of this standard? It is spatially and temporally averaged in the 55-1929 manner as air temperature. Locations of all occupant adjustable controls should be identified, and each should be provided with a legend describing what zone s it controls and what function s it controls. Intermediate, equally spaced locations may also be included in the average.